CPR LTT ELECTS TO ATTEMPT APCH AND LNDG WITH FREEZING RAIN. FLEW APCH AT HIGHER AIRSPD THAN NORMAL BUT WAS NOT ABLE TO FLARE FOR A SAFE LNDG. ACFT FELL ONTO RWY RESULTING IN THE L MAIN GEAR FAILING; L PROP STRIKING THE GND AND THE ACFT COMING TO A STOP OFF THE RWY. NO INJURIES TO PAX AND PLT.

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AFTER COMPLETING A PREFLT INSPECTION OF THE ACFT (BE20); I CONTACTED MONTGOMERY COUNTY FSS FOR A STANDARD FLT BRIEF. I WAS ADVISED OF INFLT ICING CONDITIONS AND PIREPS OF INFLT ICING. BASED UPON THIS INFO; I DETERMINED THAT THE FLT COULD BE CONDUCTED IN A SAFE MANNER AND WE DEPARTED IWS. IN RTE I OBSERVED ONLY A LIGHT AMOUNT OF RIME ICE. DURING THE DSCNT; I RECEIVED THE ADDISON ARPT ATIS WHICH STATED THERE WAS FREEZING RAIN AND ICE PELLETS AT THE ADDISON ARPT. AT THIS TIME I ADVISED A SINGLE-ENG INST PLT WHO WAS SITTING IN THE R SEAT; THAT I WAS GOING TO SHOOT THE APCH AND LNDG INTO ADDISON ARPT WITH HIGHER THAN NORMAL APCH SPDS AND FLAPS SET AT APCH FOR LNDG. THIS WAS DONE DUE TO THE POSSIBILITY THAT TAIL PLANE ICING COULD OCCUR AND WAS A RECOMMENDED PROC FROM THE ACFT AFM. THESE PROCS WERE FOLLOWED IN THE FINAL DSCNT INTO THE DFW AREA WHILE BEING VECTORED FOR THE APCH AND DURING THE APCH; DURING WHICH ALL TIMES ICING WAS OBSERVED. THE ICING ENCOUNTERED BEGAN AS LIGHT RIME WHICH TURNED TO LIGHT; MIXED AND THEN TURNED TO MODERATE; CLR ICE. THE ACFT DEICING AND ANTI-ICING EQUIP FUNCTIONED AS INTENDED. AT APPROX 1100 FT AGL; THE ACFT BROKE OUT AND VMC CONDITIONS PREVAILED AT WHICH TIME I STILL OBSERVED FREEZING RAIN ON THE ACFT TO BE ACCUMULATING ICE AT A MODERATE LEVEL. THE ACFT THEN HAD LESS THAN A HALF-INCH OF ICE WHICH; ACCORDING TO THE AFM; IS NOT ENOUGH TO INFLATE THE BOOTS. AT THIS TIME I PROCEEDED VISUALLY TO THE RWY; STILL WITH A HIGHER THAN NORMAL APCH SPD. AT APPROX XX49Z WHILE ON SHORT FINAL TO RWY 33; I OBSERVED AN INCREASE IN SINK RATE WITH NO DECREASE IN AIRSPD. I RULED OUT WINDSHEAR AND ADDED MORE PWR TO STOP THE SINK. THE SINK RATE BECAME MORE EXCESSIVE AND NOT AFFECTED BY PWR; THE ACFT THEN HAD AN UNEXPLAINED FLAT FALL AS IF IT WAS NOT PRODUCING ANY LIFT. AT THIS POINT; JUST BEFORE TOUCHDOWN WITH AIRSPD STILL WITHIN NORMAL LIMITS WITH NO STALL WARNING; I APPLIED FULL BACK PRESSURE WHICH HAD LITTLE AFFECT AS THE ACFT FELL FLAT. THE ACFT HIT; BROKE THE L MAIN GEAR; CAUSED A L SIDE PROP STRIKE; AND THE LOSS OF DIRECTIONAL CTL. THE ACFT THEN VEERED L AND STRUCK AN UNKNOWN NUMBER OF RWY LIGHTS; A THOUSAND FT SIGN; AND CAME TO REST IN THE GRASS. ALL 3 PAX AND MYSELF EXITED THE ACFT AND DETERMINED THERE WERE NO INJURIES; THE TWR WAS ADVISED OF THIS FACT. I THEN OBSERVED ICING ON THE WINGS OF THE ACFT WHICH WAS FORMED IN A PATTERN WHICH I HAD NEVER SEEN AND WAS EXTREMELY JAGGED AND UNEVEN. THE WHOLE FLT WAS CONDUCTED IN ACCORDANCE WITH AFM GUIDELINES AND RECOMMENDATIONS FOR FLT INTO ICING CONDITIONS. AFTER FOLLOWING ALL KNOWN SAFETY CONDITIONS RECOMMENDED; I BELIEVE THERE WAS NO WAY THIS HAZARD COULD HAVE BEEN PREDICTED NOR ANTICIPATED.